KYST
\kˈɪst], \kˈɪst], \k_ˈɪ_s_t]\
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This term is generally applied to a pouch or sac, - Cystoma,- without opening, and commonly of a membranous nature, which is accidentally developed in one of the natural cavities, or in the substance of organs. Many theories have been successively emitted to explain the formation of cysts, but none are entirely satisfactory. Some are formed by a thin, translucent membrane, having scarcely the thickness of the arachnoid; others of a whitish, fibrocellular membrane, more or less thick. Some contain cartilaginous or bony flakes. The greater part have but one cavity; others, on the contrary, have several, separated by complete or imperfect septa, as is frequently seen in those developed in the ovaries. The matter contained in cysts is sometimes limpid, serous, yellowish white, reddish, and, at others, more or less thick, albuminous, adipous, or caseous. The tumour, formed by them, is called Encysted.
By Robley Dunglison
Word of the day
hydromorphic
- [Greek] Structurally adapted to an aquatic environment, as organs of water plants.